@LeavesNoTrace Maybe? I really have no idea if weight matters for those types of drugs, but in general I think the average weight of a woman compared to man means women are often overmedicated. Many many drugs, if they are old drugs, were ony tested in men. Newer drugs are tested in both men and women, but they don’t analyze the women and men separately, so just recently the FDA is starting to realize often the recommended dose for adults overmedicated women and might be undermedicating men. They actually just changed dosage based on gender for Ambien. The belief is women metabolize the drug differently, and I would think weight might be a factor too. Basically the scientists were idiots, but I am off on a tangent now, but getting to a point. Obviously, your drug would be tested solely in women. The question would be what is the average weight of the women that were tested and did women who were much heavier than average have trouble with the drug? There certainly are plenty of women your weight, but are they the usual market for the drug? I don’t know the answer to that.
Your bleeding might be breakthrough bleeding. There certainly are women who swear the pill didn’t work for them and they got preggers, so there are certainly examples of the hormones not be 100% at preventing pregnancy.
When in doubt, try a different method. You can’t be nervous your birth control isn’t working. It will make you batty.
Talk to you your doctor I think.